RKI Instruments Gas Tracer - Manual (Page 86)

78 • Calibration Mode Gas Tracer Operator’s Manual
3. The recommended calibration sequence for a quarterly calibration
is WET fresh air adjustment, WET span adjustment. The
recommended calibration sequence for a biannual calibration
(every 6 months) is DRY fresh air adjustment, WET fresh air
adjustment, WET span adjustment.
Performing a Wet Fresh Air Adjustment
This section describes how to perform a fresh air adjustment on the
PPM combustible gas sensor using the WET setting. Using the WET
setting and fresh air or a zero air cylinder with a 6 inch humidifier is
appropriate for a quarterly calibration.
NOTE: It is recommended that you perform a fresh air adjust on the
ppm sensor using a zero air cylinder and the DRY setting
once every 6 months to maintain the accuracy of the ppm
combustible gas reading. When performing a DRY fresh air
adjustment, be sure to not use the humidifier tube. See
“Performing a Dry Fresh Air Adjustment” on page 79 for
instructions to perform a dry fresh air adjustment.
1. Once the warm up is complete, you will be in PPM Cal Mode and
AIR CAL will be displayed. You must perform a fresh air adjust
before performing an auto calibration, a single calibration, or a
bump test.
2. Press and release the POWER ENTER button to enter the AIR CAL
menu item.
You will be prompted to choose between WET and DRY.
MAINTENANCE
AIR CAL
MAINTENANCE
WET